package com.books.interceptor;

import com.books.constant.Constants;
import com.books.model.UserInfo;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("preHandle目标方法执行前");
        HttpSession session = request.getSession(false);
if(!checkUser(session)){
    response.setStatus(401);
    response.setContentType("text/html;charset=utf-8");
    String msg="用户未登录";
    response.getOutputStream().write(msg.getBytes("UTF-8"));
    return false;
}
        //true 放行   false  拦截
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("目标方法执行后");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    private boolean checkUser(HttpSession session){
        if(session==null||session.getAttribute(Constants.SESSION_USER_KEY)==null){
            log.warn("用户未登录");
            return false;
        }
        UserInfo userInfo=(UserInfo) session.getAttribute(Constants.SESSION_USER_KEY);
        if(userInfo==null||userInfo.getId()<0){
            log.warn("用户未登录");
            return false;
        }
        //true 放行   false  拦截
        log.info("用户已登录");
        return true;
    }
}
